Whirlwind Lance + Gambleshot support issue

I am experiencing massive performance issues when I put Gambleshot support on Whirliwind Lance. It seems like the game is having problem choosing 1 of the 3 options....The game basically becomes unplayable at that point, and my system goes into heavy load [doing the calculations + skill effects (?)].

It becomes nominal again when I switch it out from Whirlwind Lance.

Cheers